The great-tailed is the largest and longest tailed grackle.
They are common and increasing in the south western USA, Mexico, Central America and the the far north west of South America.
They nest and roost in trees and bushes, often in very noisy nocturnal gatherings in ornamental trees along city streets.
Great-tailed Grackles forage for seeds and invertebrates mainly on the ground in open areas.
I saw many in Panama City.
The song is a series of loud, rather unpleasant noises.